I agree with Gallen66 that external drivers are not required for tinyG to run NEMA 23s, but you will get maximum stepper performance, should you need it, with those external drivers.
Many folks do run with external drivers, particularly those with long running (hours at a time) Gcodes controlling high current steppers.
If you choose not to use your external drivers, be sure to provide adequate moving air (a fan) for tinyG
It is a builders choice.
I’ll add that if you do run high current/high torque motors, you should routinely check fastener torque, particularly pulley set screws.
It’s not 100% clear that some of the machine designs in service were designed to handle the power (torque) that is available these days.